Author
Topic: fuel pump not working properly (Read 461 times)

I have a 94 samurai. The fuel pump won't stay on. It it works on and off, mostly when you mess with the wires but none of the wires in perticular make it work. A previous owner changed the wiring or something and the fuel pump relay isn't even hooked up anymore. Or the main relay either. So I have no idea how its really wired. I traced all the wires and redid all the conectors and regrounded the grounds. But I still can get it to work. Any ideas?

There's no way we can help you figure out what the previous owner rewired and/or bypassed - we can guess, but that's all it will be a guess.

My guess - if he did rewire - is that he wired the pump directly into the ignition feed so that it runs when the ignition is on, not very safe, but some cars are wired like that from the factory. Suzuki shuts the pump off if the engine dies for any reason - reduces the possibility of a leak and/or a fire.

If you can get the pump to run when you "mess with the wiring" then I'd say you have a bad connection somewhere - my suggestion is that you wire a test lamp to the pump connections and mount where it can easily be seen - verify that the lamp lights (and has close to 12V) the next time the pump doesn't run - you could be fiddling with the wiring when the pump is the problem.

fordem is right on. Get your wiring diagram from ACK'S, correct the wiring (if it has been modified) and use a test light. And realize that the ECU only allows the fuel pump to run for 3 sec. +/- without motor running, each time switch is turned on.